Voice input apparatus

Details Voice input apparatus Voice input apparatus

2005-01-25

2005-01-25

Mei, Xu (Department: 2644)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Using signal channel and noise channel

C381S071110, C379S406090

Reexamination Certificate

active

06847723

ABSTRACT:
The present invention provides a voice input apparatus which can extract an input voice without interrupting a generated background sound.When a talk switch50is pushed down, a LMS algorithm processing part26stops an update operation of a filter coefficient of an adaptive filter24and stores filter coefficient W1 at this moment in a portion for storing filter coefficients30. A portion for calculating filter coefficients44calculates a filter coefficient W2 of a filter42to simulate a sound-transmittal line of an audio sound which is produced from a speaker102and is input into microphones10, 12by means of these stored filter coefficient W1 and various transmittal characteristics CS1, CS2 and the like. By extracting an output signal Y4of the filter42from an output signal Y3of a portion for eliminating surrounding noise20by means of a computing part46, audio sound components included with an operating voice collected by the microphones10, 12are removed.

REFERENCES:
patent: 5251263 (1993-10-01), Andrea et al.
patent: 5402496 (1995-03-01), Soli et al.
patent: 5581619 (1996-12-01), Shibata et al.
patent: 5740256 (1998-04-01), Castello Da Costa et al.
patent: 5796819 (1998-08-01), Romesburg

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